1. Adaikan PG, Karim SMM (1978) Effects of electrical stimulation and drugs on the smooth muscle of the human penis (Abstr 1228). In: Boissier JR, Lechat P (eds) Proceedings of the 7th International Congress of Pharmacology. Pergamon, Oxford, p 474
2. Adaikan PG, Karim SMM (1981) Adrenoreceptors in the human penis. J Auton Pharmacol 1:199–203
3. Adaikan PG, Karim SMM, Kottegoda SR, Ratnam SS (1983) Cholinoreceptors in the corpus cavernosum muscle of the human penis. J Auton Pharmacol 3:107–111
4. Adaikan PG, Kottegoda SR, Ratnam SS (1986) Is vasoactive intestinal polypeptide the principal transmitter involved in human penile erection? J Urol 135:638–640
5. Adaikan PG, Lau LC, Ng SC, Ratnam SS (1991) Physio-pharmacology of human penile erection — Autonomic/nitrergic neurotransmissions and receptors of the human corpus cavernosum. Asian Pacific J Pharmacol 6:213–217